一、Reason从句缺少宾语时用that，缺少原因状语时用why如：The reason that he told us is not true. （在从句中做直接宾语）The reason why he didn't attend the meeting is not clear. （在从句中做原因状语）此外，The reason 后的从句也可能是同位语从句，判断标准：只保留The reason 和从句（不看主句其他部分），然后再两者之间加一个is如果语义句法成立，就是同位语从句。换句话说，先行词与同位语从句有逻辑主表关系。句子不缺成分用关系副词why，缺成分用关系代词。(1)在reason作先行词的定语从句中,若从句表原因（状语）,一般用why引导定语从句,why可以用for which替换.why还可省去.The reason why (for which) he has resigned is poor health.他辞职的理由是健康状况不佳.(2)当reason用作定语从句的宾语时,引导词用that/which,而且that/which可省去.The reason (that/which) he gave for being late was that they were held up in a traffic jam他给出的迟到原因是由于他们被交通阻塞给耽误了.(3)注意句型This/That's why… This/That's the reason why…That's why he did it.(不用that代替why)这就是他为什么做这事的原因.That's the reason why he did it.(口语中可用that代替why)二、way当“way”表示“方式、方法”，the way在句中作先行词，后被一个定语从句修饰时，引导定语从句可用that，也可用in which，或什么都不用。即：1、the way+that2、the way+ in which3、the way +从句（省略了that或in which)在通常情况下，用in which引导的定语从句最为正式，用that的次之，而省略了关系代词that或in which的，反而显得更自然，最为常用。1、way做先行词，定语从句中如果缺主语、宾语或表语时，就用which或者that引导从句。若先行词在从句中做的是宾语，还可以把which或者that省略掉！例如：Can you tell me the way（which/that）you use to solve the problem？你能告诉我你解那道题的方法吗？2、way做先行词，定语从句中缺状语，从句就用in which或者that引导，引导词可以省略。例如：Can you tell me the way（in which/that）you solve the problem？1、the way作先行词，如果是在定语从句中是作主语或宾语，与其他名词做先行词用法一样。2、the way作先行词，如果是在定语从句中作状语，有三种引导方法。a .the way in whichb.the way thatc.the way 省略关系词当先行词为表示时间的名词、money或货币名称、way、place、reason等名词时，that可作为关系副词引导定语从句。这种定语从句为非正式语体，而且that总是可以省略并通常省略的。如果用介词+which引导这种从句，则为正式语体。也就是说关系副词that可以在定语从句中作时间状语、地点状语、方式状语和原因状语。例如：I like the way she was dressed. 这个句子就是省略了关系副词that。注意表示地点的名词只有place一个词可以用关系副词that引导定语从句，其它表示地点的名词不能用关系副词that，只能用关系代词that/which/where引导。例如：This is the place （that) he live. (正）This is the house (that) he live. (错）This is the house (that/which) he lives in. (正）This is the house where he lives. (正）This is the house in which he lives. (正）
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